In “Modal Epistemology” ( Phil. Studies , 1998), Peter van Inwagen defends a mitigated form of modal skepticism. In particular, he argues that while we have knowledge of many modal claims that are close to the practical concerns of everyday life, science, and even (in some cases) philosophy (e.g., Gettier possibilities), we can’t have knowledge, or even reasonable belief, regarding possibility claims remote from ordinary experience (e.g., the possibility of disembodied souls, Anselmian beings, and instances of gratuitous evil). Van Inwagen further clarifies his version of mitigated modal skepticism by means of an analogy. Just as, in prescientific times, humans confidently formed false perceptual beliefs about distant objects (e.g., the distance of the celestial bodies from the Earth) on the basis of their reliability regarding perceptual judgements about nearby objects, so in the present day philosophers erroneously form confident beliefs about “distant” possibilities on the basis of ...
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